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MIMO mode switching control method and device

A control method and spectrum efficiency technology, applied in the field of communication, can solve problems such as unguaranteed reliability, poor timeliness, and low efficiency

Inactive Publication Date: 2017-12-05
BEIJING XINWEI TELECOM TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The first is that the base station uses a timer to try the MIMO mode to be scheduled. This method directly tries scheduling without considering the UE measurement results. The reliability of the trial phase cannot be guaranteed, and the timeliness is relatively poor.
The second is that the base station uses the wireless channel quality status reported by the UE as the basis for switching the MIMO mode, and the switching time is controlled by a timer. This method continuously performs statistics and judgments in the window, which has low efficiency and poor timeliness

Method used

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  • MIMO mode switching control method and device

Examples

Experimental program
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Effect test

Embodiment 1

[0028] figure 1 It is a schematic flowchart of a MIMO mode handover control method provided in Embodiment 1 of the present invention. This embodiment is applicable to the case of switching the transmission mode at the scheduling time, and the method can be executed by a device for controlling MIMO mode switching, and the device can be configured in a base station. The MIMO mode switching control method provided in this embodiment specifically includes:

[0029] S110. Determine inner-loop spectrum efficiencies of at least two MIMO modes to be selected according to the CQI reported by the terminal.

[0030] The terminal can periodically report the CQI according to the configuration of the network, or report the CQI aperiodically according to the request initiated by the network side, which can be specifically determined by the radio resource control (Radio Resource Control, RRC) configuration issued by the base station. After receiving the CQI reported by the terminal, the inn...

Embodiment 2

[0037] figure 2 It is a schematic flowchart of a MIMO mode handover control method provided in Embodiment 2 of the present invention. This embodiment is optimized on the basis of the first embodiment above, see figure 2 , the MIMO mode switching control method provided in this embodiment specifically includes:

[0038] S210. Determine the inner-loop spectral efficiency of the currently used MIMO mode according to the CQI reported by the terminal and the mapping relationship between the CQI and the spectral efficiency.

[0039] Wherein, the mapping relationship between CQI and spectral efficiency can refer to the following Table 2. The mapping relationship between CQI and spectral efficiency can also be obtained through simulation. After receiving the CQI reported by the terminal, the inner-loop spectral efficiency of the MIMO mode in the current transmission mode can be determined according to the mapping relationship between the CQI value and the CQI and spectral efficie...

Embodiment 3

[0059] image 3 It is a schematic flow chart of determining the spectrum efficiency of the inner loop provided by Embodiment 3 of the present invention. In the actual transmission scheduling process, the terminal reports the RI value only in the transmission modes TM3, TM4, TM8, TM9 and TM10, and the determination process of the inner-loop spectrum efficiency of the MIMO mode to be selected can be specifically as follows:

[0060] S301, start.

[0061] S302. The base station receives the CQI and RI reported by the terminal.

[0062] S303, whether the current transmission mode is TM3, TM4, TM8, TM9 or TM10; if it is, go to S304, if not, go to 305.

[0063] S304. Map the inner-loop spectral efficiency of the MIMO mode in the current transmission mode according to the latest reported CQI and RI values, and perform conversion processing for other MIMO modes.

[0064] For the conversion process, reference may be made to the descriptions in the foregoing embodiments.

[0065] S3...

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Abstract

The invention discloses a MIMO mode switching control method and device. The MIMO mode switching control method comprises the following steps: confirming the inner loop spectrum efficiency of at least two MIMO modes to be selected according to the CQI reported by a terminal; updating the outer loop spectrum efficiency of the at least two MIMO modes to be selected at the moment that the terminal is scheduled to end; and selecting the MIMO mode with the largest sum of the inner loop spectrum efficiency and the outer loop spectrum efficiency in the at least two MIMO modes to be selected as the current scheduling MIMO mode at the beginning of the scheduling. According to the MIMO mode switching control method, the spectrum updating of the outer loop spectrum efficiency is related to the service type and the size of the service traffic of the terminal, the switching time of the MIMO modes is dynamic and changeable, therefore, the time delay can be reduced, the timeliness of the mode switching can be improved, and the packet error rate while mode switching can be reduced; therefore, the service stability of the mode switching is improved, and the call drop rate in a cell is reduced.

Description

technical field [0001] Embodiments of the present invention relate to the field of communication technologies, and in particular, to a MIMO mode switching control method and device. Background technique [0002] Transmission efficiency and reliability are the bottlenecks that restrict the rapid development of mobile communication systems. It is difficult to ensure system stability and maximize transmission efficiency in a wireless environment. The long term evolution (Long Term Evolution, LTE) technology system adopts multiple input multiple output (Multiple Input Multiple Output, MIMO) technology to improve transmission efficiency, improve reliability, and save wireless resources. [0003] For the downlink transmission mode (Transmission Mode, TM), the Third Generation Partnership Project (Third Generation Partnership Project, 3GPP) standard defines 10 types, as shown in Table 1 (refer to Table 7.1-5 of the 36.213 protocol). TM1 belongs to the common single-antenna port mo...

Claims

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Application Information

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IPC IPC(8): H04L1/00H04B7/0413H04W72/12
CPCH04B7/0413H04L1/0006H04L1/0015H04W72/1263
Inventor 庾小峰
Owner BEIJING XINWEI TELECOM TECH
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